Note 13 - Taxes on Income (Details) - Effective Income Tax Rate Reconciliation - USD ($) $ in Thousands	12 Months Ended
	Jan. 03, 2016	Dec. 28, 2014	Dec. 29, 2013
Effective Income Tax Rate Reconciliation [Abstract]
Income taxes at U.S federal statutory rate	$ 37,018	$ 12,510	$ 24,151
Increase (decrease) in taxes resulting from:
State income taxes, net of federal tax effect	3,003	57	496
Non-deductible business expenses	614	570	601
Non-deductible employee compensation	168	491	409
Tax effects of Company owned life insurance	128	(395)	(1,117)
Tax effects of undistributed earnings from foreign subsidiaries not deemed to be indefinitely reinvested	458	362	562
Foreign and U.S. tax effects attributable to foreign operations	(3,347)	(3,021)	(3,958)
Valuation allowance effect – State NOL	(3,797)	468	3,232
Non-deductible reserve against capital asset	0	0	(218)
Advance pricing agreements with tax authorities	0	0	(2,492)
Federal tax credits	(352)	0	(595)
Other	(545)	(108)	(322)
Income tax expense	$ 33,348	$ 10,934	$ 20,749